JP2009150220A - Drain pipe structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drain pipe structure capable of quickly generating siphon force in a drain pipe, when waste water is generated from a drain apparatus. <P>SOLUTION: This drain pipe structure has the drain pipe 6 having a drain vertical pipe 1 formed of a small diameter drain pipe and connected to the drain apparatus 4, and treats the waste water flowing in the drain pipe 6 using the principle of a siphon. An upstream side end part of the drain pipe 6 is connected to the drain apparatus 4 via a water head pressure acquiring means 23 for applying water head pressure for pushing out either one or both of the waste water and air staying on the downstream side of the waste water to the waste water flowing toward the drain vertical pipe 1 from the drain apparatus 4. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a drainage pipe structure that realizes smooth drainage by utilizing the principle of siphon and that can prevent bad odors and insects from entering indoors.

  The drainage pipe structure in a general building is constructed by arranging a water-sealed trap for each drainage device or in the middle of the drainage path, and is configured to prevent bad odors and pests from entering the indoor space. Has been. Moreover, in order to maintain the function of the water seal trap, it is said that the internal pressure of the drain pipe that is naturally flowing should be close to atmospheric pressure (avoid full water).

  Recently, a drainage system using the principle of siphon has been proposed (see, for example, Patent Documents 1 to 4). This technology is designed to be able to suck the drainage on the upstream side by the suction force generated behind the circulating drainage when the drainage drains down the drainage standpipe constituting the pipe line in a full state, Smooth drainage and a reduction in the diameter of the drain pipe to about 15 mm to 40 mm can be realized.

  A siphon is a bent pipe that is used to raise a liquid to a high place and move it to a low place.In the present invention described below, when the liquid falls in a substantially full state in the pipe, The principle of generating a suction action on the side is called “siphon principle”, and the force generated by this siphon principle is called “suction force” or “siphon force”.

  In the drainage pipe structure described above, when the drainage standpipe is constituted by a small-diameter pipe, when drainage occurs from the drainage device provided at the upstream end of the drainage standpipe, the drained drainage fills the drainage standpipe. As it flows down in a state, a suction force is generated inside the drainage stand upstream of the drainage. This suction force acts on the drainage present in the drainage device and the drainage pipe on the downstream side of the drainage device, and these can flow smoothly.

  Since the drainage system using the siphon principle uses a small-diameter drainage pipe, when the drainage pipe is accommodated inside the wall or under the floor, the piping space occupied by the drainage pipe can be reduced. For this reason, there exists an advantage that the internal space of a wall and an underfloor space can be utilized effectively. In addition, it is possible to allow a slight reverse gradient from the drainage device to the junction at a sufficiently low position, and use flexible pipes in addition to general piping materials such as hard PVC pipes. Is possible.

  In particular, when the drain pipe is configured using a flexible pipe, it is possible to perform piping without providing a seam between the drainage device and the junction, and the workability can be greatly improved. Also, by using a flexible pipe, the flexible pipe can be routed through the inside of the sheath pipe, and when there is a need for renewal, it is possible to work without breaking the walls, floor, and ceiling. There is also.

  As described above, since the drainage system using the siphon principle has few gradient restrictions, there is an advantage that it is possible to avoid obstacles on the piping route and to move the drainage device after completion. These advantages are advantageous in considering the construction plan, construction cost, and ease of use after construction.

Japanese Patent Laid-Open No. 06-042019 JP 2000-074260 A JP 2001-271406 A JP 2002-121792 A.

  However, in the drain pipe structure as described above, if the drain pipe has a reverse slope, the drainage drained from the drainage device is once moved to the top of the reverse slope by some means before exerting the siphon force. In each of the above-mentioned patent documents, a pump is provided, or the height difference between the drainage device and the top of the reverse gradient is used. In the former case, electric energy is required, and equipment such as a motor and a pump, wiring, and the like are required.

In addition, when using the height difference, since the drain pipe has a small diameter, the replacement of the air staying in the drain pipe with the drainage to flow into the drain pipe is not easily performed. There is a possibility that the residual drainage between the device and the highest part of the drain pipe cannot be pushed out in the downstream direction. For example, as shown in FIG. 10 (a), for drainage 55 in between at highest part 54 to drain 51 draining device 52 flows to the downstream direction, necessary to overcome the height H ₁ of the highest part 54 There is. However, as shown in FIG. (B), the water head pressure generated in the drainage device 52 and H _{2 (towards} of an H ₁ is greater than H _2), drainage 55 towards the highest part 54 H ₂ Although it rises only, it will equilibrate on the way, and continuous drainage cannot be realized. That is, as shown in FIG. 3C, when drainage occurs in the drainage device 52, it is necessary to quickly replace the air present in the drainage pipe 51.

  An object of the present invention is to provide a drain pipe structure that can quickly generate a siphon force in a drain pipe when drainage is generated from a drainage device.

  In order to solve the above-mentioned problems, a drain pipe structure according to the present invention includes a drain pipe having a drain standing pipe formed by a small-diameter drain pipe and connected to a drainage device, and uses the siphon principle in the drain pipe. A drain pipe structure for treating drainage flowing through the drainage pipe, wherein the upstream end portion of the drainage pipe is either drainage or air staying downstream from the drainage in the drainage flowing from the drainage device toward the drainage standpipe. One or both of them are connected to the drainage device via a head pressure acquisition means for applying head pressure to push the drain head toward the drainage standpipe.

  In the above drain pipe structure, the accumulated drainage generates the head pressure by providing the head pressure acquisition means on the most upstream side of the small-diameter drain pipe. For this reason, quick drainage can be realized regardless of the presence or absence of air in the drainage pipe connected to the water head pressure acquisition means.

  In the drain pipe structure, the drain pipe has one or a plurality of reverse gradient portions, and the water head pressure acquisition means has a height greater than the sum of the heights of the one or more reverse gradient portions. And a drain chamber having a cross-sectional area larger than that of the small-diameter drain pipe.

  That is, even when a reverse slope is formed in the drain pipe, the drainage having the head pressure obtained by the head pressure acquisition means quickly flows into the reverse slope portion to replace or push out the air present in the drain pipe. , The reverse gradient portion can be overcome. When drainage passes through the reverse slope part of the drainage pipe and reaches the drainage standpipe, a siphon effect is produced, so that the upstream drainage officer can quickly drain the water.

  In the drain pipe structure, the drain chamber is preferably formed to have an inner diameter of 1.5 times or more of an inner diameter of the drain pipe or a cross-sectional area equivalent to the inner diameter. The means preferably includes a ventilation means that is opened to the atmosphere upstream of the drainage chamber, and the small-diameter drainage pipe preferably has a nominal diameter of 15 mm to 40 mm.

  In the drainage pipe structure, smooth and quick drainage can be realized even when a reverse gradient exists in the drainage pipe.

  Moreover, it is preferable that a water seal trap is provided downstream from the lower end of the drainage vertical pipe on which the siphon force acts, and an outlet of the water seal trap is open to the atmosphere.

  Moreover, it is preferable that the exit of the said water seal trap is provided in the position which becomes higher than the lower end part of the said water seal trap.

  According to the drain pipe structure according to the present invention, even if a reverse gradient is formed in the drain pipe by providing the head pressure acquisition means on the most upstream side of the small-diameter drain pipe, By replacing, drainage can flow in quickly and get over the reverse slope. For this reason, it is possible to realize a quick drainage by applying a suction force to the drain pipe on the upstream side of the drainage.

It is a figure which illustrates typically the drainage pipe structure which provided the water seal trap in the level below the lower end of a drainage vertical pipe. It is a figure explaining the relationship between a drainage standpipe and a water seal trap. It is the figure which looked at FIG. 2 from the front, and is a figure explaining the example of installation of a drainage standpipe. It is a figure explaining the example which connected the some drainage pipe to one water seal trap. It is a figure which illustrates typically the example which provided the drainage chamber as a water head pressure acquisition means. It is a figure explaining the structure of the waste_water | drain chamber in a kitchen. It is a figure explaining the structural example of the waste_water | drain chamber in a toilet bowl. It is the figure which provided the ventilation means to the drainage chamber. It is a figure explaining the example which provided the drainage chamber in the uppermost stream side of the drainage pipe, and provided the water seal trap in the level below the lower end of a drainage standpipe. It is a figure explaining the subject at the time of a reverse slope part existing in a drain pipe. It is a figure explaining the subject at the time of draining from a wash bowl.

  Hereinafter, preferred embodiments of the drain pipe structure according to the present invention will be described. The present invention relates to a drainage method for dropping a drainage pipe in a full state by using a small-diameter drainage pipe when draining from a drainage device in order to exert siphon force. By providing a water-sealed trap downstream thereafter, it is configured to prevent breakage regardless of the action of the siphon force, and to reliably block odors and prevent indoor entry of pests and the like. .

  In addition, by providing a head pressure acquisition means upstream of the drain pipe, the air existing upstream of the reverse slope portion of the drain pipe is replaced with drainage even though the reverse slope portion exists in the small diameter drain pipe. Or, it can be pushed out by drainage, and the drainage that has flowed into the reverse slope portion of the drain pipe can be quickly passed through, and the siphon effect can be surely generated to achieve quick drainage upstream of the reverse slope portion. It is what I did.

  The diameter of the drain pipe is not particularly limited, but is set to a sufficiently small value as compared with the diameter of the conventional drain pipe. In other words, the drainage side branch pipe and the drainage standing main pipe in the conventional middle and low-rise houses generally use a pipe having a nominal diameter of about 100 mm, but in the present invention, a pipe having a nominal diameter of about 15 mm to 40 mm. Can be preferably employed. A particularly desirable tube diameter range is 15 to 25 mm.

  The drainage pipe used in the present invention does not limit the material or configuration of the pipe, but uses a straight straight pipe having rigidity, such as a PVC pipe or a metal pipe, or a flexible pipe having flexibility. Is possible.

  One drainage standpipe is connected to one drainage device. That is, in the piping structure according to the present invention, one drain pipe is connected to each bathtub, wash bowl, kitchen sink, or other drainage device, and a drainage stand is provided for each drain pipe. And the drain pipe which has a drainage standpipe is connected to the drainage basin at the terminal end side of the drainage standpipe and is opened to the atmosphere. Therefore, it is advantageous to connect the water seal trap to the drainage trap and to open the downstream end of the water seal trap with the drainage trap. By providing the water-sealed trap in this way, it becomes possible to share the installation location of the water-sealed trap with the drainage basin.

  The lower end of the drainage pipe does not mean the lower end portion of the drainage pipe arranged in the vertical direction, but the suction force acting on the drainage device located at the most upstream side in the drainage pipe arranged in the vertical direction. It means a position that can secure a sufficient height to generate Therefore, the position of the water seal trap is lower than the position where the drain pipe arranged in the vertical direction can secure the height, and the water seal is sealed even if the suction force by the drainage flowing out of the water seal trap acts. It is a level that can be secured.

  As mentioned above, by setting the position of the water seal trap in the drainage standpipe, it is possible to secure the amount of seal water and prevent breakage, no matter what amount of drainage flows. It becomes. As described above, the preferred installation position of the water seal trap in the drainage stand is the lower end of the drainage stand and the vicinity of the part where the drainage pipe is connected to the drainage basin.

  The drainage pipe does not necessarily have to be configured by vertically erecting the drainage pipe, and any drainage pipe may be used as long as it is guided downward from above. In other words, if the siphon force sufficient to realize quick drainage can be generated by the drainage flowing down the drainage pipe, the drainage pipe does not have to be installed vertically and is inclined. Will not cause any problems.

  For this reason, even if the position of the drainage device installed indoors and the drainage basin installed outdoors are misaligned, the drainage standpipe is constructed by inclining the drainage pipe and piping it into the wall It is possible. Thus, even if the drainage standpipe is a straight pipe and not installed in the vertical direction, a sufficient siphon force can be generated, so even if a flexible pipe is used for the indoor drainage pipe and the drainage standpipe, the siphon type It is possible to construct a drainage system.

  The water-sealed trap provided below the drainage drain has a function of sealing the odor generated from the drainage basin and preventing it from entering the indoors, and preventing insects from entering the indoors. The water-sealed trap is composed of a U-shaped tube that can always hold water having a height (water level) of about 50 mm or more. A trap is formed so that the drain pipe between the water-sealed trap and the drainage device can be blocked from the outdoor drainage basin.

  By installing the water seal trap at the above position, when the drainage flows down into the drainage standpipe, the drainage passes through the seal ring trap, the siphon force disappears, and then the flow stops due to the resistance to water flow. Drainage remaining in the vertical pipe (for example, drainage adhered to the pipe wall) flows in, and it is possible to secure sealed water in the watertight trap.

  Conventionally, for example, when a bathtub is embedded in concrete, a water-sealed trap is installed near the drainage basin that is the discharge destination, or in cold areas, the water-sealed trap is installed underground to prevent freezing of the sealed water. However, in these cases, a siphon drainage system is not adopted, and a natural drainage drainage system is adopted.

  Further, in the above-described configuration of the present invention, the extension distance of the drainage pipe including the drainage stand pipe between the drainage device and the water-sealed trap increases, so that there is a concern that a bad odor is generated inside the drainage pipe. However, according to the inventor's knowledge, drainage using the siphon principle has a higher flow rate than natural flow-through drainage, so dirt is less likely to adhere to the pipe, and the drainage pipe has a small diameter. Compared with the drain pipe, the surface area that may cause foul odors to adhere is reduced, and the drain pipe is thin, so the pipe air upstream from the water seal trap is difficult to replace with indoor air, and so on. There is no risk of entering indoors.

  The head pressure acquisition means provided on the most upstream side of the small-diameter drain pipe in the present invention stays upstream of the reverse slope portion in the drain pipe when the drain pipe has a reverse slope. The function of substituting the existing air with the drainage is exerted, and a head pressure greater than the height of the reverse gradient portion is applied to the drainage drained from the drainage device to get over the reverse gradient portion. In particular, when a flexible pipe is used as the drain pipe, this problem can be easily overcome because the flexible pipe easily forms a reverse slope portion.

  The head pressure greater than the height of the reverse slope portion means a head pressure greater than the sum of the heights of the reverse slope portions existing in the drain pipe. That is, when there are a plurality of reverse gradient portions in the drain pipe, the head pressure is greater than the height obtained by adding the heights of the individual reverse gradient portions.

  The water head pressure acquisition means that can perform the above function includes a drain chamber having a sufficient depth with respect to the height of the reverse slope portion assumed in the drain pipe and a sufficient thickness with respect to the diameter of the drain pipe, or drainage. There is a ventilation means provided on the upstream side of the inversely inclined portion assumed in the pipeline, and any of them can be used.

  In the case of a drainage chamber, even if there are a plurality of reverse slope portions in the drain pipe, it is sufficient that the depth is larger than the sum of these reverse slope portions, and this drain chamber may be provided at the drain outlet of the drainage device. .

  When a drainage chamber is used as the water head pressure acquisition means, it is preferable that the sectional area of the drainage chamber is set sufficiently larger than the sectional area of the drainage pipe. According to the knowledge of the present inventor, it was possible to realize reliable and quick replacement by setting the diameter of the drainage chamber to about 1.5 times the diameter of the drainage pipe or more.

  Also, it is possible to generate water head pressure that is sufficiently larger than the height of the reverse slope part assumed in the drain pipe (the height of the sum of these when there are multiple reverse slope parts). By being configured in this way, the drainage flowing into the drainage chamber from the drainage device can surely get over the reverse slope portion in the drainage pipe and exert the siphon effect.

  Here, the height of the reverse gradient portion is the difference A between “the tube at the top of the reverse gradient (the center)” and “the tube (the center) at the upstream side of the reverse gradient, which is horizontal”. The height of the drainage chamber is a difference B between the “upper end of the drainage chamber” and “the center of the connection portion between the drainage chamber and the small-diameter drainage pipe”, and preferably B> A. Further, when there are n reverse gradient portions, it is preferable that B> nA.

  Next, a preferred embodiment of the drain pipe structure will be described with reference to the drawings.

  1 to 3, a water seal trap 2 is provided downstream from the lower end of the drainage standpipe 1, and the open end of the water seal trap 2 is opened to a drainage basin 3 buried in the ground. The drained water that has flowed down is directly drained into the drainage basin 3. A drainage device 4 such as a bathtub, a wash bowl or a kitchen sink is connected to the upstream end of the drainage stand 1. Further, the connecting pipe 5 extending from the drainage device 4 to the drainage vertical pipe 1 is arranged in the vertical direction and the horizontal direction in the interior space of the building and the space under the floor.

  There are substantially one drainage vertical pipe 1 and connecting pipe 5 from the drainage device 4 to the water seal trap 2. That is, a drain pipe 6 including one connecting pipe 5 and a drain stand pipe 1 is configured for each drainage device 4.

  When the drainage device 4 is installed on the second floor or the third floor, the drainage stand 1 is disposed in an in-wall space 7 a formed in the outer wall 7. The lower end of the drainage pipe 1 passes through the outer wall 7 at the upper end portion of the foundation 8 and is connected to an external pipe 9 led to the drainage basin 3. A water-sealed trap 2 is provided. In the figure, reference numeral 12 denotes site piping.

  Further, in the case where the target drainage device 4 is arranged on the first floor, for example, as shown in FIGS. 6 and 8, when the reverse slope portion 20 is positively formed in the drain pipe in the lower floor 10, The reverse gradient portion 20 functions as the water-sealed trap 2. That is, when the piping on the downstream side of the reverse gradient portion 20 passes under the floor in a substantially horizontal state, and then the drop through the foundation to the drainage basin 3 is small, the drainage chambers 23 and 21 provide driving force to the drainage. It will function as a drainage pipe.

  As described above, even when the drainage device 4 is installed on the first floor, or when it is installed on the second floor or higher, the water seal trap 2 is provided downstream of the drainage pipe 1. Become.

  Further, the drainage stand 1 does not necessarily need to be installed in the vertical direction in the wall space 7a, and is sufficient to suck the drainage upstream of the drainage when the drainage drops down the drainage stand1. What is necessary is just to be able to generate siphon force. That is, any of the drainage stand 1 installed in the vertical direction shown in the center of FIG. 3 and the drainage stand 1 bent with a relatively strong curve shown on the right side and the left side of FIG. A sufficient suction force can be applied to the drainage device 4 connected to the.

  The connecting pipe 5 is a pipe that connects the drainage device 4 and the upper end of the drainage standpipe 1, and is a pipe that is appropriately formed according to the installation position and height of the drainage device 4. The connecting pipe 5 can be freely installed in the underfloor space 10 for each floor without having a configuration that actively exerts a siphon effect.

  The pipe constituting the drainage pipe 1 and the connecting pipe 5 may be a straight pipe such as a vinyl chloride pipe or a steel pipe, but in the present embodiment, a long synthetic resin pipe having flexibility is used. The resin pipe is used by cutting the length after setting the length according to a preset route from the drainage device 4 to the drainage basin 1. For this reason, the path from the drainage device 4 to the water sealing trap 2 can be formed by a single drainage pipe 6, and even if there is a bent part in the middle, a joint such as an elbow is not required, and piping It is possible to reduce the resistance and eliminate the possibility that the filth is caught.

  Further, in this embodiment, the drainage pipe 6 is constructed by inserting a flexible synthetic resin pipe into the sheath pipe 11 which is installed along a preset pipe route and fixed to a column or a beam at a predetermined position. The sheath pipe construction method is adopted.

  In the above configuration, the diameter of the synthetic resin pipe constituting the drain pipe 6 that can exhibit a sufficient siphon force may be about 20 mm. Further, the outer diameter of the sheath tube for accommodating the synthetic resin tube is about 40 mm.

  In the drainage pipe structure, the drainage flowing from the drainage device 4 can apply a suction force to the upstream side when the drainage stand 1 is dropped, and the drainage in the drainage device 4 is discharged by the action of the suction force. It is possible to drain by sucking positively. And when the waste water which distribute | circulated the drain pipe 6 arrives at the water seal trap 2, this waste water will pass the water seal trap 2 in a full state, and will be open | released by the drainage basin 3. And it joins with the other drainage basin 3 through the site drainage pipe 12 connected to the drainage basin 3.

  FIG. 4 shows an example in which a plurality of drain pipes 6 are concentrated on one water-sealed trap 2. In this case, the water-sealed trap 2 is not a trap made of a U-shaped tube, but is constructed by inserting the end portion of the drain pipe 6 into a trough in which water is stored so that the function as a trap can be exhibited. . In this case, even if it is broken, the sealed water is restored by using any one connected drainage device, so that it can be stored immediately.

  Next, an example in which a drainage chamber 23 serving as a head pressure acquisition means is provided at the most upstream part of the drainage pipe 6 having the reverse gradient part 20 will be described with reference to FIGS.

  In the figure, the drainage chamber 23 is provided at the drainage outlet of the drainage device 4 which is the most upstream part of the drainage pipe 6, and the depth is the height of the reverse gradient portion 20 (the reverse gradient portions exist at a plurality of locations). In the case, the sum of the heights of the respective reverse gradient portions and the water-sealed trap are set to be larger. For example, when the height of the reverse gradient portion existing in the drain pipe 6 is 120 mm, the depth of the drain chamber 23 may be 120 mm or more, but the depth is set to 300 mm to more than that.

  The cross-sectional area of the drain chamber 23 is set to about 1.5 times or more the cross-sectional area of a pipe (a flexible synthetic resin pipe) constituting the drain pipe 6. In this embodiment, the diameter of the drain pipe 6 is set to 20 mm, and the diameter of the drain chamber 23 is set to 50 mm. However, the drain chamber 23 is not limited to the above-mentioned diameter, and can be selectively used in a range of about 40 mm to 75 mm.

  In the drain pipe 6 configured as described above, the drainage drained from the drainage device 4 is accumulated in the drainage chamber 23, and water head pressure corresponding to the accumulated depth is generated. Therefore, even when air and water are alternately present in the drain pipe 6 due to the reverse gradient, the water head pressure of the drainage accumulated in the drain chamber 23 is larger than the height of the reverse slope portion 20 in the drain pipe 6. When it becomes, it flows into the drain pipe 6 from the drain chamber 23, gets over the reverse gradient part 20 at a stretch, and distribute | circulates downstream. For this reason, the inside of the drain pipe 6 is filled with water, a siphon force is generated, and thereafter drainage continues until there is no water remaining in the drainage device 4.

  FIG. 7 is a view for explaining an example in which a drain chamber 23 is provided at the drain of a wash bowl as the drainage device 4. FIG. 2A shows a case where a pocket 24 a is formed at a connection portion between the drainage device 4 and the drainage chamber 23, and the pocket 24 a is connected to the overflow port 24 b of the wash bowl 4. In this configuration, when drainage is generated from the drainage device 4, the pocket 24 a and the overflow port 24 b function as an air discharge passage existing in the drainage chamber 23. For this reason, even when the inlet of the drainage chamber 23 is small, the air in the drainage chamber 23 can be expelled efficiently, and the necessary water head pressure can be obtained quickly. By the way, when there is no drainage chamber, if the siphon force is strong, as shown in FIG. 11 (a), the drainage and the air entered from the overflow port flow alternately to generate noise, and the drainage time is long.

  FIG. 7B shows a case where a drain chamber 23 is provided at the drain port of the drainage device 4 as a wash bowl, and a barrier cylinder 25 for preventing the generation of vortices is disposed in the drain chamber 23. In this case, even if the water is drained from the drainage device 4, as shown in FIG. 11 (b), no vortex is generated at the drainage port, and the air that weakens the siphon force is not involved in the drained water. Therefore, the strong siphon effect can be continuously exhibited until the drainage is exhausted.

  FIG. 8 shows an example in which a vent pipe 26 is provided in the drain chamber 21. The vent pipe 26 is open to the atmosphere in a state where the end portion is disposed at a position higher than the upper surface of the drainage device 4. If the vent pipe 26 is not provided, the drainage accumulated in the drainage device 4 has the height of the reverse gradient portion due to the wastewater staying in the reverse gradient portion 20 and the air sandwiched between the drainage and the drainage device 4. Unless it surpasses the water level, it can hardly move downstream. That is, it cannot drain.

  However, in the drainage pipe structure configured as shown in FIG. 8, the air existing between the drainage device 4 and the reverse gradient portion 20 can move to the atmosphere via the vent pipe 26, and thus the drainage of the drainage device 4. However, since the head pressure is generated in the drain chamber 21, it flows over the reverse gradient portion 20 at a stretch and flows downstream. In this process, the siphon effect is exerted and the reverse gradient portion 20 is introduced. A suction force can be applied to the upstream side. This suction force acts on the drainage device 4, and when the drainage is retained in the drainage device 4, the retained drainage can be sucked and drained quickly.

  FIG. 9 shows that the drainage chamber 23 is provided on the uppermost stream side of the drainage pipe 6 and the watertight trap 2 is provided at a level below the lower end of the drainage vertical pipe 1 to prevent the watertight trap from being broken. It is a figure explaining the drain pipe structure which can implement | achieve quick drainage even if it is a case where a gradient exists.

  In this figure, when the connection part of the drainage pipe 6 to the drainage chamber 23 is located at the side face 23b separated from the bottom part 23a, the drainage drained from the drainage device 4 contains a substance having a specific gravity greater than that of water. It is also possible to precipitate this substance on the bottom 23 a of the drainage chamber 23.

DESCRIPTION OF SYMBOLS 1 Drainage pipe 2 Water seal trap 3 Drainage trap 4 Drainage appliance 5 Connecting pipe 6 Drainage pipe 7 Outer wall 7a Wall space 8 Foundation 9 External pipe 10 Underfloor 11 Sheath pipe 20 Reverse gradient part 21 Drain chamber 23 Drain chamber 23a Bottom 23b Side 24a Pocket 24b Overflow port 25 Barrier cylinder 26 Ventilation pipe

Claims (7)

A drain pipe structure including a drain pipe having a drain standing pipe formed by a small-diameter drain pipe and connected to a drainage device, and treating drainage flowing through the drain pipe using the principle of siphon,
The upstream end portion of the drainage pipe pushes one or both of wastewater and air staying downstream from the drainage into the drainage flowing from the drainage device toward the drainage standpipe toward the drainage standpipe. A drainage pipe structure connected to the drainage device through a head pressure acquisition means for applying head pressure. The drain pipe has one or a plurality of reverse gradient portions,
The water head pressure acquisition means includes a drainage chamber that is formed at a height that is greater than the sum of the heights of the one or more inversely inclined portions and that has a cross-sectional area that is greater than the cross-sectional area of the small-diameter drainage pipe. The drain pipe structure according to claim 1, wherein the drain pipe structure is provided. The drainage pipe structure according to claim 2, wherein the drainage chamber is formed to have an inner diameter that is 1.5 times the inner diameter of the drainage pipe or a cross-sectional area equivalent to the inner diameter. 4. The drain pipe structure according to claim 2, wherein the water head pressure acquisition unit includes a vent unit that is opened to the atmosphere upstream of the drain chamber. The drain pipe structure according to any one of claims 1 to 4, wherein the small-diameter drain pipe has a nominal diameter of 15 mm to 40 mm. The drain pipe structure according to any one of claims 1 to 5, wherein a water seal trap is provided downstream from the lower end of the drain stand pipe, and an outlet of the water seal trap is open to the atmosphere. .   The drain pipe structure according to claim 6, wherein an outlet of the water seal trap is provided at a position above a lower end portion of the water seal trap.

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